2 Chainz unwraps the strange and celebratory video for “Birthday Song,” the second single off his No. 1 album Based on a T.R.U. Story. The clip, which he describes as “left field,” co-stars Kanye West and plenty of big booties.

The Atlanta rapper, who just reached 1 million followers on Twitter, explained how he connected with ‘Ye. “It was an idea I had. He heard it. Of course he felt like he got that present already,” 2 Chainz told Rap-Up TV, referring to Kim Kardashian.